capture bash output values inside perl script

Question

I have a bash script that sets two variables to values (not a STDOUT) . I want to store those variables inside a perl script.

Sorry dont have example.. but this is the requirement. any thoughts please

In shell script i am doing something like this

source <Script Name> <Variable1> <Variable2>
Value1=$output1
Value2=$output2

===================== I want to do same inside perl

Tried

system("sh <Script> <Variable1> <Variable2>");
$Value1 = "$output1";
$Value2 = "$output2";
print $Value1

Getting Blank

Is 'output1' just the name of a variable internal to the script? You'll need to communicate it somehow, probably by writing its value to a stream. Variables internal to the script will not be directly available to its caller. — William Pursell
– William Pursell, Commented Aug 5, 2020 at 21:06
so the shell script <Script Name> sets the variables $output1 and $output2 ? — Håkon Hægland
– Håkon Hægland, Commented Aug 5, 2020 at 21:51
@Kris :First of all, that is no bash involved in your code (you explicitly run your script with sh), so I suggest to remove the bash tag. For sending values from your bash script back to Perl, you can use either stdout, or an external file, or maybe a bidirectional pipe. In all cases, you have to parse the output from your script. — user1934428
– user1934428, Commented Aug 6, 2020 at 7:01

Håkon Hægland · Accepted Answer · 2020-08-05 22:25:21Z

3

To build on the answer by @Snorik, here is one way you can do it:

system 'bash', '-c', 'source xyz.sh; echo -n $output1 >1.txt; echo -n $output2 >2.txt';
my $output1 = `cat 1.txt`;
my $output2 = `cat 2.txt`;

answered Aug 5, 2020 at 22:25

Håkon Hægland

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3 Comments

user1934428 Over a year ago

Should be i.e. echo -n "$output1" >1.txt, to preserve the number of spaces in the variable.

Kris Over a year ago

Thank you i wrote a wrapper to the shell script and redirect the output to file and then i will use that file in perl script

Snorik Over a year ago

can you answer your own question please?

Snorik · Accepted Answer · 2020-08-05 20:40:22Z

1

As Bash doesnt allow to use actual return values, the easiest way is the bash script to write each value to a file and then read each value from the file.

Have a look at this

answered Aug 5, 2020 at 20:40

Snorik

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1 Comment

Kris Over a year ago

Unfortunately i dont have access to the bash script, all that i can do is to capture the variables and use it

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